gnu: Add rust-async-task-1.

* gnu/packages/crates-io.scm (rust-async-task-1): New variable.

gnu/packages/crates-io.scm

@@ -1328,6 +1328,31 @@ (define-public rust-async-stream-impl-0.3
 crate.")
     (license license:expat)))
 
+(define-public rust-async-task-1
+  (package
+    (name "rust-async-task")
+    (version "1.3.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "async-task" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0p88087z43zvv924my16a17qd65kdlv1r59h80h73rvrn0bc1hha"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-libc" ,rust-libc-0.2)
+        ("rust-winapi" ,rust-winapi-0.3))
+       #:cargo-development-inputs
+       (("rust-crossbeam" ,rust-crossbeam-0.7)
+        ("rust-futures" ,rust-futures-0.3))))
+    (home-page "https://github.com/stjepang/async-task")
+    (synopsis "Task abstraction for building executors")
+    (description
+     "This package provides a task abstraction for building executors.")
+    (license (list license:asl2.0 license:expat))))
+
 (define-public rust-async-trait-0.1
   (package
     (name "rust-async-trait")